NASA has been developing, in the interest for going to Mars, the ability to grow meat in vats.

How will this change the world, if meat is grown in vats? What happens to the species of animals we have grown for meat so long that they can not live without or our aid? Are there medical uses, like if a solder gets a portion of there thigh blown off, can the muscle be replaced instead of hoping it grows back? What sort of tinkering will go on to make custom or gourmet meats? Will people contract with Zoos and game preserves (and poachers) to get samples of endangered species for the sake of haveing Panda ribs or a Rhino steak? As no animals are killed in the process, you just need a few starter cells of a kind of meat and you can grow it into slabs, does this mean those who are curious about how human flesh tastes will be able to indulge themselves? (Soylent Green!!!)